Oral Presentation

Magnetic fields at the footprints of the filament hosting bipolar bubbles using JCMT/SCUBAPOL2 - a case study of S201

Author(s): Eswaraiah Chakali (NTHU, Taiwan), Shih-Ping Lai (NTHU, Taiwan), Jia-Wei Wang (NTHU, Taiwan), and Manash R. Samal (NCU, Taiwan)

Presenter: Eswaraiah Chakali (National Tsing Hua University (NTHU))

Based on the observational facts that (a) B-fields help in the formation of filamentary molecular clouds, and (ii) B-fields influence the expanding I-fronts emanated from the HII regions, we investigate the influence of B-fields not only in the formation of bipolar bubbles but also in the formation and evolution of dense clumps/cores located in the filament. We present preliminary results based on JCMT/SCUBAPOL2 850 micron dust emission polarization observations towards Sh2-201. POL2 observations have revealed B-fields at the footprints of the filament where two clumps are located at the two edges of the HII region. We suggest that B-fields in these clumps are clearly shaped by the impact of expanding I-fronts emanated from the HII region. Estimated B-field pressure found to dominate over the turbulent and thermal pressures suggesting that B-fields have shaped the geometry of the bipolar bubble at the footprints. B-fields could be weaker at the initial stage, later they become strong enough, due to the impact of HII region, to regulate the feedback processes.